morfishine: Fairly quickly, I spotted 19.Qa3 Bxa3 20.Nxa7# and thought "Wow, thats the fastest Friday I ever solved" but then noticed Black has 19...Qxb5 spoiling the party

So, lets change the move-order:

<19.Nxa7+ Bxa7 20.Qa3> Black is extremely cramped here; 21.Qxa7 is a huge threat; defending the Bishop with 20...b6 doesn't work due to 21.Rxb6 and White has a winning attack threatening 22.Qc5+ and 22.Qa6+

Black Queen must vacate d7 to allow the King to flee, but where?

(1) 20...Qc6 21.Qxa7 Qa6 22.Qb8+ Kd7 23.Rxb7+ Ke6 24.Qe5#

(2) 20...Qf5 21.Qxa7 Qe4 (at first I thought this was a great defense for Black, but this fails to 22.Rfe1 Qc6 23.Re7)

I don't think Black can hold this position

*****
PM: a pure positional sacrifice and an exquisite example of how changing the move order makes all the difference (although I haven't tried my luck with "Ole Crafty" yet)

Amongst other avenues I tried
19. Nxa7 Bxa7
20. Qa3...
and concluded: this is obviously going nowhere...
It is bad enough not seeing the 'solution' but when you see it and don't recognise it, that is doubly depressing. Better go and learn why black resigned ...

JohnBoy: I solved this completely - by spending a minute or two trying desperately to make 19.Qa3 work. There was no way around ...Qxb5. But after 19.Nxa7 and 20.Qa3 black can neither guard the B nor move it.

Next, with the white queen under the gun and white's pawn disadvantage, while 19.Qa3 was luring, I thought white must accelerate the game and immediately threaten the black King. Therefore the obvious:

19 Nxa7 Bxa7

Then went down the route of

20 Rxb7 with no resolution and too slow.

Therefore, the only suitable option for a forceful attack became

20 Qa3

From here, any of black's options lead to death (...Bb8, ...Bb6,...b6,...b5,...)

White has four pieces aiming at the black king. The first idea that comes to mind is 19.Qa3, threatening 20.Qxc5+ and 20.Nxa7+. However, after 19... Qxb5 20.Qh3+ Qd7 White is a piece down and the attack vanished (21.Rxb7 Kxb7 22.Rb1+ Bb6).

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Patriot: <Phony Benoni> Yes I think you are right about 18...Qf5. I thought it failed to the simple 18...b6 since there is no 19.Rxb6 follow-up. 18...Qf5 is a much more active move I probably should have addressed in the original position (if I had seen it).

tpstar: In this Caro-Kann PBA, 6 ... Bg4 can be met with the simple 7. Be2 Opening Explorer and White scores well. Any ... dxc4 becomes a temporary gambit, then Black's Kingside development is terribly slow, or else ... 0-0-0 like here.

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